steps:
- ${{ if eq(variables['Build.Reason'], 'PullRequest') }}:
  - script: |
      set -ex
      tar_branch=origin/$(System.PullRequest.TargetBranch)
      git diff $tar_branch..HEAD --name-only | grep -v -f .azure-pipelines/vstest-exclude && exit 0
      git diff $tar_branch..HEAD --name-only | grep -f .azure-pipelines/vstest-include && exit 0
      set +x
      echo "Skip vstest jobs"
      echo "##vso[task.setvariable variable=SKIP_VSTEST;isOutput=true]YES"
    name: SetVar
    displayName: "Check if vstest is needed."